| /* |
| * NVMe over Fabrics loopback device. |
| * Copyright (c) 2015-2016 HGST, a Western Digital Company. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| #include <linux/scatterlist.h> |
| #include <linux/blk-mq.h> |
| #include <linux/nvme.h> |
| #include <linux/module.h> |
| #include <linux/parser.h> |
| #include "nvmet.h" |
| #include "../host/nvme.h" |
| #include "../host/fabrics.h" |
| |
| #define NVME_LOOP_MAX_SEGMENTS 256 |
| |
| struct nvme_loop_iod { |
| struct nvme_request nvme_req; |
| struct nvme_command cmd; |
| struct nvme_completion rsp; |
| struct nvmet_req req; |
| struct nvme_loop_queue *queue; |
| struct work_struct work; |
| struct sg_table sg_table; |
| struct scatterlist first_sgl[]; |
| }; |
| |
| struct nvme_loop_ctrl { |
| struct nvme_loop_queue *queues; |
| |
| struct blk_mq_tag_set admin_tag_set; |
| |
| struct list_head list; |
| struct blk_mq_tag_set tag_set; |
| struct nvme_loop_iod async_event_iod; |
| struct nvme_ctrl ctrl; |
| |
| struct nvmet_ctrl *target_ctrl; |
| }; |
| |
| static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) |
| { |
| return container_of(ctrl, struct nvme_loop_ctrl, ctrl); |
| } |
| |
| struct nvme_loop_queue { |
| struct nvmet_cq nvme_cq; |
| struct nvmet_sq nvme_sq; |
| struct nvme_loop_ctrl *ctrl; |
| }; |
| |
| static struct nvmet_port *nvmet_loop_port; |
| |
| static LIST_HEAD(nvme_loop_ctrl_list); |
| static DEFINE_MUTEX(nvme_loop_ctrl_mutex); |
| |
| static void nvme_loop_queue_response(struct nvmet_req *nvme_req); |
| static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); |
| |
| static struct nvmet_fabrics_ops nvme_loop_ops; |
| |
| static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) |
| { |
| return queue - queue->ctrl->queues; |
| } |
| |
| static void nvme_loop_complete_rq(struct request *req) |
| { |
| struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); |
| |
| nvme_cleanup_cmd(req); |
| sg_free_table_chained(&iod->sg_table, true); |
| nvme_complete_rq(req); |
| } |
| |
| static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) |
| { |
| u32 queue_idx = nvme_loop_queue_idx(queue); |
| |
| if (queue_idx == 0) |
| return queue->ctrl->admin_tag_set.tags[queue_idx]; |
| return queue->ctrl->tag_set.tags[queue_idx - 1]; |
| } |
| |
| static void nvme_loop_queue_response(struct nvmet_req *req) |
| { |
| struct nvme_loop_queue *queue = |
| container_of(req->sq, struct nvme_loop_queue, nvme_sq); |
| struct nvme_completion *cqe = req->rsp; |
| |
| /* |
| * AEN requests are special as they don't time out and can |
| * survive any kind of queue freeze and often don't respond to |
| * aborts. We don't even bother to allocate a struct request |
| * for them but rather special case them here. |
| */ |
| if (unlikely(nvme_loop_queue_idx(queue) == 0 && |
| cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { |
| nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, |
| &cqe->result); |
| } else { |
| struct request *rq; |
| |
| rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); |
| if (!rq) { |
| dev_err(queue->ctrl->ctrl.device, |
| "tag 0x%x on queue %d not found\n", |
| cqe->command_id, nvme_loop_queue_idx(queue)); |
| return; |
| } |
| |
| nvme_end_request(rq, cqe->status, cqe->result); |
| } |
| } |
| |
| static void nvme_loop_execute_work(struct work_struct *work) |
| { |
| struct nvme_loop_iod *iod = |
| container_of(work, struct nvme_loop_iod, work); |
| |
| nvmet_req_execute(&iod->req); |
| } |
| |
| static enum blk_eh_timer_return |
| nvme_loop_timeout(struct request *rq, bool reserved) |
| { |
| struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); |
| |
| /* queue error recovery */ |
| nvme_reset_ctrl(&iod->queue->ctrl->ctrl); |
| |
| /* fail with DNR on admin cmd timeout */ |
| nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; |
| |
| return BLK_EH_HANDLED; |
| } |
| |
| static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, |
| const struct blk_mq_queue_data *bd) |
| { |
| struct nvme_ns *ns = hctx->queue->queuedata; |
| struct nvme_loop_queue *queue = hctx->driver_data; |
| struct request *req = bd->rq; |
| struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); |
| blk_status_t ret; |
| |
| ret = nvme_setup_cmd(ns, req, &iod->cmd); |
| if (ret) |
| return ret; |
| |
| iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
| iod->req.port = nvmet_loop_port; |
| if (!nvmet_req_init(&iod->req, &queue->nvme_cq, |
| &queue->nvme_sq, &nvme_loop_ops)) { |
| nvme_cleanup_cmd(req); |
| blk_mq_start_request(req); |
| nvme_loop_queue_response(&iod->req); |
| return BLK_STS_OK; |
| } |
| |
| if (blk_rq_bytes(req)) { |
| iod->sg_table.sgl = iod->first_sgl; |
| if (sg_alloc_table_chained(&iod->sg_table, |
| blk_rq_nr_phys_segments(req), |
| iod->sg_table.sgl)) |
| return BLK_STS_RESOURCE; |
| |
| iod->req.sg = iod->sg_table.sgl; |
| iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); |
| iod->req.transfer_len = blk_rq_bytes(req); |
| } |
| |
| blk_mq_start_request(req); |
| |
| schedule_work(&iod->work); |
| return BLK_STS_OK; |
| } |
| |
| static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) |
| { |
| struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); |
| struct nvme_loop_queue *queue = &ctrl->queues[0]; |
| struct nvme_loop_iod *iod = &ctrl->async_event_iod; |
| |
| memset(&iod->cmd, 0, sizeof(iod->cmd)); |
| iod->cmd.common.opcode = nvme_admin_async_event; |
| iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; |
| iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
| |
| if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, |
| &nvme_loop_ops)) { |
| dev_err(ctrl->ctrl.device, "failed async event work\n"); |
| return; |
| } |
| |
| schedule_work(&iod->work); |
| } |
| |
| static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, |
| struct nvme_loop_iod *iod, unsigned int queue_idx) |
| { |
| iod->req.cmd = &iod->cmd; |
| iod->req.rsp = &iod->rsp; |
| iod->queue = &ctrl->queues[queue_idx]; |
| INIT_WORK(&iod->work, nvme_loop_execute_work); |
| return 0; |
| } |
| |
| static int nvme_loop_init_request(struct blk_mq_tag_set *set, |
| struct request *req, unsigned int hctx_idx, |
| unsigned int numa_node) |
| { |
| struct nvme_loop_ctrl *ctrl = set->driver_data; |
| |
| return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), |
| (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); |
| } |
| |
| static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
| unsigned int hctx_idx) |
| { |
| struct nvme_loop_ctrl *ctrl = data; |
| struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; |
| |
| BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); |
| |
| hctx->driver_data = queue; |
| return 0; |
| } |
| |
| static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
| unsigned int hctx_idx) |
| { |
| struct nvme_loop_ctrl *ctrl = data; |
| struct nvme_loop_queue *queue = &ctrl->queues[0]; |
| |
| BUG_ON(hctx_idx != 0); |
| |
| hctx->driver_data = queue; |
| return 0; |
| } |
| |
| static const struct blk_mq_ops nvme_loop_mq_ops = { |
| .queue_rq = nvme_loop_queue_rq, |
| .complete = nvme_loop_complete_rq, |
| .init_request = nvme_loop_init_request, |
| .init_hctx = nvme_loop_init_hctx, |
| .timeout = nvme_loop_timeout, |
| }; |
| |
| static const struct blk_mq_ops nvme_loop_admin_mq_ops = { |
| .queue_rq = nvme_loop_queue_rq, |
| .complete = nvme_loop_complete_rq, |
| .init_request = nvme_loop_init_request, |
| .init_hctx = nvme_loop_init_admin_hctx, |
| .timeout = nvme_loop_timeout, |
| }; |
| |
| static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) |
| { |
| nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
| blk_cleanup_queue(ctrl->ctrl.admin_q); |
| blk_mq_free_tag_set(&ctrl->admin_tag_set); |
| } |
| |
| static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) |
| { |
| struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); |
| |
| if (list_empty(&ctrl->list)) |
| goto free_ctrl; |
| |
| mutex_lock(&nvme_loop_ctrl_mutex); |
| list_del(&ctrl->list); |
| mutex_unlock(&nvme_loop_ctrl_mutex); |
| |
| if (nctrl->tagset) { |
| blk_cleanup_queue(ctrl->ctrl.connect_q); |
| blk_mq_free_tag_set(&ctrl->tag_set); |
| } |
| kfree(ctrl->queues); |
| nvmf_free_options(nctrl->opts); |
| free_ctrl: |
| kfree(ctrl); |
| } |
| |
| static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) |
| { |
| int i; |
| |
| for (i = 1; i < ctrl->ctrl.queue_count; i++) |
| nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); |
| } |
| |
| static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) |
| { |
| struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; |
| unsigned int nr_io_queues; |
| int ret, i; |
| |
| nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); |
| ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); |
| if (ret || !nr_io_queues) |
| return ret; |
| |
| dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); |
| |
| for (i = 1; i <= nr_io_queues; i++) { |
| ctrl->queues[i].ctrl = ctrl; |
| ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); |
| if (ret) |
| goto out_destroy_queues; |
| |
| ctrl->ctrl.queue_count++; |
| } |
| |
| return 0; |
| |
| out_destroy_queues: |
| nvme_loop_destroy_io_queues(ctrl); |
| return ret; |
| } |
| |
| static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) |
| { |
| int i, ret; |
| |
| for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
| ret = nvmf_connect_io_queue(&ctrl->ctrl, i); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) |
| { |
| int error; |
| |
| memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); |
| ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; |
| ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; |
| ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ |
| ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; |
| ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + |
| SG_CHUNK_SIZE * sizeof(struct scatterlist); |
| ctrl->admin_tag_set.driver_data = ctrl; |
| ctrl->admin_tag_set.nr_hw_queues = 1; |
| ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; |
| ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; |
| |
| ctrl->queues[0].ctrl = ctrl; |
| error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); |
| if (error) |
| return error; |
| ctrl->ctrl.queue_count = 1; |
| |
| error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); |
| if (error) |
| goto out_free_sq; |
| ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; |
| |
| ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); |
| if (IS_ERR(ctrl->ctrl.admin_q)) { |
| error = PTR_ERR(ctrl->ctrl.admin_q); |
| goto out_free_tagset; |
| } |
| |
| error = nvmf_connect_admin_queue(&ctrl->ctrl); |
| if (error) |
| goto out_cleanup_queue; |
| |
| error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); |
| if (error) { |
| dev_err(ctrl->ctrl.device, |
| "prop_get NVME_REG_CAP failed\n"); |
| goto out_cleanup_queue; |
| } |
| |
| ctrl->ctrl.sqsize = |
| min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); |
| |
| error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); |
| if (error) |
| goto out_cleanup_queue; |
| |
| ctrl->ctrl.max_hw_sectors = |
| (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); |
| |
| error = nvme_init_identify(&ctrl->ctrl); |
| if (error) |
| goto out_cleanup_queue; |
| |
| return 0; |
| |
| out_cleanup_queue: |
| blk_cleanup_queue(ctrl->ctrl.admin_q); |
| out_free_tagset: |
| blk_mq_free_tag_set(&ctrl->admin_tag_set); |
| out_free_sq: |
| nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
| return error; |
| } |
| |
| static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) |
| { |
| if (ctrl->ctrl.queue_count > 1) { |
| nvme_stop_queues(&ctrl->ctrl); |
| blk_mq_tagset_busy_iter(&ctrl->tag_set, |
| nvme_cancel_request, &ctrl->ctrl); |
| nvme_loop_destroy_io_queues(ctrl); |
| } |
| |
| if (ctrl->ctrl.state == NVME_CTRL_LIVE) |
| nvme_shutdown_ctrl(&ctrl->ctrl); |
| |
| blk_mq_quiesce_queue(ctrl->ctrl.admin_q); |
| blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, |
| nvme_cancel_request, &ctrl->ctrl); |
| blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); |
| nvme_loop_destroy_admin_queue(ctrl); |
| } |
| |
| static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) |
| { |
| nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); |
| } |
| |
| static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) |
| { |
| struct nvme_loop_ctrl *ctrl; |
| |
| mutex_lock(&nvme_loop_ctrl_mutex); |
| list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { |
| if (ctrl->ctrl.cntlid == nctrl->cntlid) |
| nvme_delete_ctrl(&ctrl->ctrl); |
| } |
| mutex_unlock(&nvme_loop_ctrl_mutex); |
| } |
| |
| static void nvme_loop_reset_ctrl_work(struct work_struct *work) |
| { |
| struct nvme_loop_ctrl *ctrl = |
| container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); |
| bool changed; |
| int ret; |
| |
| nvme_stop_ctrl(&ctrl->ctrl); |
| nvme_loop_shutdown_ctrl(ctrl); |
| |
| ret = nvme_loop_configure_admin_queue(ctrl); |
| if (ret) |
| goto out_disable; |
| |
| ret = nvme_loop_init_io_queues(ctrl); |
| if (ret) |
| goto out_destroy_admin; |
| |
| ret = nvme_loop_connect_io_queues(ctrl); |
| if (ret) |
| goto out_destroy_io; |
| |
| blk_mq_update_nr_hw_queues(&ctrl->tag_set, |
| ctrl->ctrl.queue_count - 1); |
| |
| changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); |
| WARN_ON_ONCE(!changed); |
| |
| nvme_start_ctrl(&ctrl->ctrl); |
| |
| return; |
| |
| out_destroy_io: |
| nvme_loop_destroy_io_queues(ctrl); |
| out_destroy_admin: |
| nvme_loop_destroy_admin_queue(ctrl); |
| out_disable: |
| dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); |
| nvme_uninit_ctrl(&ctrl->ctrl); |
| nvme_put_ctrl(&ctrl->ctrl); |
| } |
| |
| static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { |
| .name = "loop", |
| .module = THIS_MODULE, |
| .flags = NVME_F_FABRICS, |
| .reg_read32 = nvmf_reg_read32, |
| .reg_read64 = nvmf_reg_read64, |
| .reg_write32 = nvmf_reg_write32, |
| .free_ctrl = nvme_loop_free_ctrl, |
| .submit_async_event = nvme_loop_submit_async_event, |
| .delete_ctrl = nvme_loop_delete_ctrl_host, |
| }; |
| |
| static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) |
| { |
| int ret; |
| |
| ret = nvme_loop_init_io_queues(ctrl); |
| if (ret) |
| return ret; |
| |
| memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); |
| ctrl->tag_set.ops = &nvme_loop_mq_ops; |
| ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; |
| ctrl->tag_set.reserved_tags = 1; /* fabric connect */ |
| ctrl->tag_set.numa_node = NUMA_NO_NODE; |
| ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; |
| ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + |
| SG_CHUNK_SIZE * sizeof(struct scatterlist); |
| ctrl->tag_set.driver_data = ctrl; |
| ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; |
| ctrl->tag_set.timeout = NVME_IO_TIMEOUT; |
| ctrl->ctrl.tagset = &ctrl->tag_set; |
| |
| ret = blk_mq_alloc_tag_set(&ctrl->tag_set); |
| if (ret) |
| goto out_destroy_queues; |
| |
| ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); |
| if (IS_ERR(ctrl->ctrl.connect_q)) { |
| ret = PTR_ERR(ctrl->ctrl.connect_q); |
| goto out_free_tagset; |
| } |
| |
| ret = nvme_loop_connect_io_queues(ctrl); |
| if (ret) |
| goto out_cleanup_connect_q; |
| |
| return 0; |
| |
| out_cleanup_connect_q: |
| blk_cleanup_queue(ctrl->ctrl.connect_q); |
| out_free_tagset: |
| blk_mq_free_tag_set(&ctrl->tag_set); |
| out_destroy_queues: |
| nvme_loop_destroy_io_queues(ctrl); |
| return ret; |
| } |
| |
| static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, |
| struct nvmf_ctrl_options *opts) |
| { |
| struct nvme_loop_ctrl *ctrl; |
| bool changed; |
| int ret; |
| |
| ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); |
| if (!ctrl) |
| return ERR_PTR(-ENOMEM); |
| ctrl->ctrl.opts = opts; |
| INIT_LIST_HEAD(&ctrl->list); |
| |
| INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); |
| |
| ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, |
| 0 /* no quirks, we're perfect! */); |
| if (ret) |
| goto out_put_ctrl; |
| |
| ret = -ENOMEM; |
| |
| ctrl->ctrl.sqsize = opts->queue_size - 1; |
| ctrl->ctrl.kato = opts->kato; |
| |
| ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), |
| GFP_KERNEL); |
| if (!ctrl->queues) |
| goto out_uninit_ctrl; |
| |
| ret = nvme_loop_configure_admin_queue(ctrl); |
| if (ret) |
| goto out_free_queues; |
| |
| if (opts->queue_size > ctrl->ctrl.maxcmd) { |
| /* warn if maxcmd is lower than queue_size */ |
| dev_warn(ctrl->ctrl.device, |
| "queue_size %zu > ctrl maxcmd %u, clamping down\n", |
| opts->queue_size, ctrl->ctrl.maxcmd); |
| opts->queue_size = ctrl->ctrl.maxcmd; |
| } |
| |
| if (opts->nr_io_queues) { |
| ret = nvme_loop_create_io_queues(ctrl); |
| if (ret) |
| goto out_remove_admin_queue; |
| } |
| |
| nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); |
| |
| dev_info(ctrl->ctrl.device, |
| "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); |
| |
| nvme_get_ctrl(&ctrl->ctrl); |
| |
| changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); |
| WARN_ON_ONCE(!changed); |
| |
| mutex_lock(&nvme_loop_ctrl_mutex); |
| list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); |
| mutex_unlock(&nvme_loop_ctrl_mutex); |
| |
| nvme_start_ctrl(&ctrl->ctrl); |
| |
| return &ctrl->ctrl; |
| |
| out_remove_admin_queue: |
| nvme_loop_destroy_admin_queue(ctrl); |
| out_free_queues: |
| kfree(ctrl->queues); |
| out_uninit_ctrl: |
| nvme_uninit_ctrl(&ctrl->ctrl); |
| out_put_ctrl: |
| nvme_put_ctrl(&ctrl->ctrl); |
| if (ret > 0) |
| ret = -EIO; |
| return ERR_PTR(ret); |
| } |
| |
| static int nvme_loop_add_port(struct nvmet_port *port) |
| { |
| /* |
| * XXX: disalow adding more than one port so |
| * there is no connection rejections when a |
| * a subsystem is assigned to a port for which |
| * loop doesn't have a pointer. |
| * This scenario would be possible if we allowed |
| * more than one port to be added and a subsystem |
| * was assigned to a port other than nvmet_loop_port. |
| */ |
| |
| if (nvmet_loop_port) |
| return -EPERM; |
| |
| nvmet_loop_port = port; |
| return 0; |
| } |
| |
| static void nvme_loop_remove_port(struct nvmet_port *port) |
| { |
| if (port == nvmet_loop_port) |
| nvmet_loop_port = NULL; |
| } |
| |
| static struct nvmet_fabrics_ops nvme_loop_ops = { |
| .owner = THIS_MODULE, |
| .type = NVMF_TRTYPE_LOOP, |
| .add_port = nvme_loop_add_port, |
| .remove_port = nvme_loop_remove_port, |
| .queue_response = nvme_loop_queue_response, |
| .delete_ctrl = nvme_loop_delete_ctrl, |
| }; |
| |
| static struct nvmf_transport_ops nvme_loop_transport = { |
| .name = "loop", |
| .create_ctrl = nvme_loop_create_ctrl, |
| }; |
| |
| static int __init nvme_loop_init_module(void) |
| { |
| int ret; |
| |
| ret = nvmet_register_transport(&nvme_loop_ops); |
| if (ret) |
| return ret; |
| |
| ret = nvmf_register_transport(&nvme_loop_transport); |
| if (ret) |
| nvmet_unregister_transport(&nvme_loop_ops); |
| |
| return ret; |
| } |
| |
| static void __exit nvme_loop_cleanup_module(void) |
| { |
| struct nvme_loop_ctrl *ctrl, *next; |
| |
| nvmf_unregister_transport(&nvme_loop_transport); |
| nvmet_unregister_transport(&nvme_loop_ops); |
| |
| mutex_lock(&nvme_loop_ctrl_mutex); |
| list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) |
| nvme_delete_ctrl(&ctrl->ctrl); |
| mutex_unlock(&nvme_loop_ctrl_mutex); |
| |
| flush_workqueue(nvme_wq); |
| } |
| |
| module_init(nvme_loop_init_module); |
| module_exit(nvme_loop_cleanup_module); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ |